| 词汇 | periodic |
| 词根词缀 | 词源： 1642, from Fr. périodique (14c.), from L. periodicus, from periodus (see period). Periodical "magazine that publishes regularly" is first attested 1798. Periodic table in chemistry is from notion of the arrangement, in which similar properties recur at intervals in elements in the same area as you read down the rows of the table. This sense of the word is attested fromj 1872. |
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